The Mg-Sn alloys,with basal or prismatic Mg2Sn laths,were employed to reveal the effect of precipitate orientation on twinning behavior quantitatively.The Mg-5wt.%Sn alloys with basal or prismatic Mg2Sn were compresse...The Mg-Sn alloys,with basal or prismatic Mg2Sn laths,were employed to reveal the effect of precipitate orientation on twinning behavior quantitatively.The Mg-5wt.%Sn alloys with basal or prismatic Mg2Sn were compressed to study the twinning behaviors.Subsequently,an Orowan strengthening model was developed to quantitatively investigate the critical resolved shear stress(CRSS)increment of precipitates on twinning.The results revealed that the prismatic precipitates hindered the transfer and growth of tensile twins more effectively compared with the basal precipitates.The decreased proportion of tensile twins containing prismatic Mg2Sn might be attributed to a larger CRSS increment for tensile twins compared with that for basal precipitates.The obvious decreased twinning transfer in the alloy with prismatic Mg2Sn could be due to its higher geometrically necessary dislocation and enhanced CRSS of tensile twins.Notably,the prismatic precipitates have a better hindering effect on tensile twins during compression.展开更多
采用 LBL(layer- by- layer)法制备了 Cu2 Sn S3 薄膜。即首先采用电化学方法在 Sn O2 衬底上制备 Sn S薄膜 ,然后又在其上用化学沉积法制备 Cu S薄膜 ,最后进行退火处理得到厚度约为960 nm的 Cu2 Sn S3 薄膜。探讨了薄膜的制备机理、...采用 LBL(layer- by- layer)法制备了 Cu2 Sn S3 薄膜。即首先采用电化学方法在 Sn O2 衬底上制备 Sn S薄膜 ,然后又在其上用化学沉积法制备 Cu S薄膜 ,最后进行退火处理得到厚度约为960 nm的 Cu2 Sn S3 薄膜。探讨了薄膜的制备机理、生长速度、结构和光学特性。制备的薄膜为多晶(Cu2 Sn S3 ) 72 z(三斜或假单斜晶系 )结构 ,其直接光学带隙约为 1 .0 5 e V。展开更多
基金National Natural Science Foundation of China(Nos.52004227,U22A20187,52201106)the China Postdoctoral Science Foundation(No.2020M683240)+1 种基金the Key Area Research and Development Program of Guangdong ProvinceChina(No.2020B090924002)。
文摘The Mg-Sn alloys,with basal or prismatic Mg2Sn laths,were employed to reveal the effect of precipitate orientation on twinning behavior quantitatively.The Mg-5wt.%Sn alloys with basal or prismatic Mg2Sn were compressed to study the twinning behaviors.Subsequently,an Orowan strengthening model was developed to quantitatively investigate the critical resolved shear stress(CRSS)increment of precipitates on twinning.The results revealed that the prismatic precipitates hindered the transfer and growth of tensile twins more effectively compared with the basal precipitates.The decreased proportion of tensile twins containing prismatic Mg2Sn might be attributed to a larger CRSS increment for tensile twins compared with that for basal precipitates.The obvious decreased twinning transfer in the alloy with prismatic Mg2Sn could be due to its higher geometrically necessary dislocation and enhanced CRSS of tensile twins.Notably,the prismatic precipitates have a better hindering effect on tensile twins during compression.
文摘为快速制备高化学计量比的SnS_2薄膜,介绍了一种简单的旋涂热解法,以Sn Cl4·5H2O和硫脲分别为Sn源和S源,在空气中及热解温度分别为200℃、260℃和320℃时制备了系列SnS_2薄膜,这是首次使用旋涂热解法制备SnS_2薄膜的尝试。采用EDS、XRD、Raman、SEM、UV-Vis等手段研究了热解温度对SnS_2薄膜元素组成、晶相、形貌、光学吸收等的影响,在热解温度为260℃且仅需热解2 min条件下,获得了Sn/S原子比为1/1.98的高化学计量比SnS_2薄膜,该薄膜直接禁带宽度为2.50 e V,非常适合作为太阳能电池窗口层。
文摘采用 LBL(layer- by- layer)法制备了 Cu2 Sn S3 薄膜。即首先采用电化学方法在 Sn O2 衬底上制备 Sn S薄膜 ,然后又在其上用化学沉积法制备 Cu S薄膜 ,最后进行退火处理得到厚度约为960 nm的 Cu2 Sn S3 薄膜。探讨了薄膜的制备机理、生长速度、结构和光学特性。制备的薄膜为多晶(Cu2 Sn S3 ) 72 z(三斜或假单斜晶系 )结构 ,其直接光学带隙约为 1 .0 5 e V。
